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Key Programming Car Keys The majority of brick and mortar locksmiths and dealership parts departments have tools that can assist you in programming replacement keys or restore the immobilizer's data. These tools are typically bidirectional OBD-II units. Insert the new key and switch it to the on position, without starting the engine. Repeat this process a few times within a specified time period, which is usually identified by the door locks being on the move or chiming. Self-programming In the majority of modern vehicles the ke